STATE GUIDE · UPDATED 2026
Every OurPrenup agreement is built for the laws where you live. In Montana, a prenup is formally called a premarital agreement.
Start your Montana prenupYes — prenuptial agreements are legally enforceable in Montana under the Uniform Premarital Agreement Act (UPAA) (Mont. Code Ann. §§ 40-2-601 to 40-2-610 (Uniform Premarital Agreement Act)). To be valid, the agreement must be in writing, signed voluntarily by both partners, and made with fair financial disclosure. It should be notarized (strongly recommended, though not legally required), and both partners should have a real opportunity to review it well before the wedding.
Courts divide marital property fairly (not necessarily equally) unless your agreement says otherwise.
Yes. Montana enforces prenuptial agreements under the Uniform Premarital Agreement Act (UPAA). The governing law is Mont. Code Ann. §§ 40-2-601 to 40-2-610 (Uniform Premarital Agreement Act). The agreement must be in writing and signed by both partners, entered into voluntarily, and made with fair financial disclosure.
Montana law formally calls a prenup a "premarital agreement." It works the same way: a written contract two people sign before marriage that sets out property and financial rights.
Notarization is not strictly required in Montana, but strongly recommended — a notarized agreement is significantly harder to challenge in court, and OurPrenup's Montana signing instructions include it.
No — Montana does not require witnesses for a prenuptial agreement. Both partners' signatures (ideally notarized) are what matter.
No — Montana does not require either partner to hire a lawyer for a valid prenup. Independent review is still recommended, and every OurPrenup agreement documents that both partners had the opportunity to seek counsel.
No. Montana is an equitable distribution state — without an agreement, courts divide marital property "fairly," which is not necessarily equally. A prenup replaces that uncertainty with rules you both chose.
Yes — Montana allows couples to set, limit, or waive spousal support in a prenup, subject to fairness review and statutory safety valves that protect a spouse from being left in hardship. OurPrenup offers a full waiver, payment formulas with amounts you choose, or leaving support to state law.
Each partner must make a fair and reasonable disclosure of their assets, debts, and income before signing. Hiding assets is the fastest way to make a prenup unenforceable in Montana. OurPrenup builds sworn financial disclosure schedules for both partners into every agreement.
Montana has no fixed statutory deadline, but signing well before the wedding matters: agreements signed days before a wedding are the easiest to attack as pressured. Most attorneys recommend having the agreement finished at least 30 days before the wedding.
Attorney-drafted prenups in Montana commonly run $1,500–$5,000+ per couple. OurPrenup is a flat $599 per couple for a complete Montana-specific premarital agreement, financial disclosure schedules for both partners, a plain-language summary, and step-by-step Montana signing instructions — with optional online e-sign and notarization for $50.
Both parties review the final premarital agreement and all attached financial schedules.
Both parties sign the premarital agreement.
Have the agreement notarized. While Montana does not legally require notarization, we strongly recommend it. Notarized agreements are significantly harder to challenge in court.
Keep the original signed agreement in a safe location. Provide copies to both parties and their attorneys.
3 people total at signing
This guide is general information about Montana law, not legal advice. For advice on your specific situation, consult a licensed attorney in Montana. See our full legal disclaimer.
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